Engraving-machine.



N0. 7D4,|93. Patented July 8, I902.

R. JAY.

ENGBAVING MACHINE.

(Applicationflled Oct. 9, 1.901.)

(No Model.)

//L' in 6 6/6245 m: NOHRIS PEYEHS co. PHoruuwo. WASHINGTON. a. c

UNITED STATES PATENT OFFICE.

RUDOLF JAY, OF LEIPSIO, GERMANY.

ENGRAVlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 704,193, dated July 8, 1902.

Application filed October 9,1901. Serial No. 78,053. (No model.)

To (tZZ whom it ntay concern:

Be it known that I, RUDOLE JAY, a citizen of Germany, and a resident of Ileipsic, Germany, have invented certain new and useful Improvements in Engraving-Machines, of which the following is a specification.

This invention relates to an engraving-machine more particularly designed to reproduce patterns in relief by means of engraving-tools which are gradually conducted over the surface of the work-pieces and to which a rapid rotating motion is imparted.

The invention consists more particularly in the means by which a uniform motion is imparted to the engraving-tools independently from the motion imparted to the work-pieces, so that a more reliable and uniform movement of the engraving-tools is insured.

In the accompanying drawings, Figure 1 is afront elevation of the machine; Fig. 2, an end elevation, and Fig. 3 a plan.

a is an electric motor turning by worm a and the worm-wheel b the main shaft 1), to which the worms b b b are attached. By means of the worm-wheels c d the shafts c dare uniformly turned. Theshaft c bears upon its end the pattern-plate 0 while the shafts d carry the plates d to be engraved.

b is a pulley fixed to shaft 6, which is connected by belt g with pulleyf, fast on shaft f. Shaft f transmits motion by worm f worm-wheel h, shaft h, worm 7L2, and wormwheel 2" to a screw 1 In this way results a turning of the screw 2', which turning causes a downward motion of a slide 79, engaged by said screw. To the slide it is pivoted a lever m, carrying the tracing and engraving tools 0 q and connected by universal joint n 92 to an arm n of the machine-frame A.

Upon the lever m is mounted the holder 0 for the tracing-tool and two, more or less, sliding holders g of the engraving-tools q. The spindles q of the engraving-tools q turn in bearings g of the sliding tool-holders g and are each driven by an electric motor 8, mounted upon the spindle q. These motors are thus also carried by the tool-holders and cause the engraving-tools to rotate with uniform speed and entirely independent from the main shaft 5. In this Way all transmission is avoided and a quiet and uniform movement of the engraving-tools is insured.

The slide 71; has a contact t, gliding over a I number of contacts u of an electric resistance. This resistance is switched into the circuit of the electric motor a in such a manner that by moving the slide it with the contact 2f downward the speed of the shaft 1) is gradually diminished. Thus as the path of the tools 0 and q is increased the movement of the model and work-pieces is correspondingly decreased.

The operation is as follows: The tools 0 and q are set in proper relative position to the pattern and work-pieces, and the electric motors a and s are switched in. The motor a will by shaft 7) rotate the pattern c and the work-pieces (1 The shaft 1) will also by the transmission described turn the screw 2' to gradually lower the slide 70, and thereby depress the end of lever m, so as to cause the pattern and work-pieces to be gradually traversed by the tools. After the operation is and the slide it is raised to its elevated position by means of asuitable hand-crank it, ready for the next operation.

Nhat I claim is- 1. In an engraving-machine, the combination of a rotatable screw with a slide engaged thereby, a lever pivoted to the slide, a tracing tool and an engraving tool mounted upon the lever, an electric motor for driving the screw, a resistance in the circuit of the motor, and a contact mounted upon the slide and gliding upon said resistance, substantially as specified.

2. In an engraving-machine, the combination of an electric motor with a shaft driven thereby, pattern-plates and work-plates rotated by said shaft, a screw, means intermediate the shaft and screw for rotating the lat ter, a slide engaged by the screw, a lever pivoted to the slide, a tracing-tool and an engraving-tool carried by the lever, means for rotating the engraving-tool, an electric resistance in the circuit of the electric motor, and a contact on the slide that engages said resistance, substantially as specified.

Signed by me at Leipsic, Germany, this 24th day of September, 1901.

RUDOLF JAY.

Witnesses:

RUDOLPH FRICKE, B. 11. WARNER, Jr.

completed the motors a and s are switched off 

